[CMake] Testing an exe with gtest - possible?

[Kyle Edwards]

On Wed, 2019-11-20 at 00:54 +0100, cen wrote:
> Hi
> 
> I have an existing c++ exe project which I want to test with gtest.
> I 
> have not yet found an easy way to keep the project as is and test it 
> directly since gtest insists (obviously) to link against the code
> being 
> tested. I found a smart answer on SO to link against object files
> and 
> that works ok but it's messy and a lot of manual setup after cmake 
> project generation, probably impossible to automate in cmake.
> 
> The other quick way is to change the VS project output to a static
> lib. 
> That also works but is a manual step which again not sure can be 
> automated at all. And there is a bigger issue hidden in here.. I
> can't 
> link to this lib due to dual main() entry point.
> 
> So unless there is some smart workaround to keep project as an exe
> and 
> get gtest to work, I guess the only remaining option is to separate
> the 
> main() into a small bootstrap exe and then link against the rest of
> the 
> program (which contains the actual testable logic) as a lib. Finally,
> if 
> I understand correctly, using target_link_libraries will
> automatically 
> set up the two projects as dependent and lib will always get built 
> before the main is run.

Check out the $<TARGET_OBJECTS:...> generator expression. This will let
you link directly against the object files built for the executable.

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Kyle